CN203814023U - PAM2842-based dimmable LED driver - Google Patents

PAM2842-based dimmable LED driver Download PDF

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Publication number
CN203814023U
CN203814023U CN201420239219.2U CN201420239219U CN203814023U CN 203814023 U CN203814023 U CN 203814023U CN 201420239219 U CN201420239219 U CN 201420239219U CN 203814023 U CN203814023 U CN 203814023U
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CN
China
Prior art keywords
circuit
resistance
chip
pam2842
drive circuit
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Expired - Fee Related
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CN201420239219.2U
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Chinese (zh)
Inventor
罗文强
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JIANGSU SHINUO LIGHTING CO Ltd
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JIANGSU SHINUO LIGHTING CO Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The utility model discloses a PAM2842-based dimmable LED driver, which comprises a rectifier and filter circuit, a frequency setting circuit, a PWM dimming circuit, a current detection circuit, an over-voltage protection circuit, a constant-current drive circuit and an LED load. The rectifier and filter circuit, the constant-current drive circuit and the LED load are connected together in turn. The frequency setting circuit, the PWM dimming circuit, the current detection circuit, and the over-voltage protection circuit are respectively connected with the constant-current drive circuit. According to the technical scheme of the utility model, due to the adoption of the integrated control chip PAM2842, the dimming function is realized through the PWM of digital signals, and the dimming accuracy is higher. Meanwhile, the PAM2842-based dimmable LED driver is strong in anti-interference capability, high in efficiency, good in heat dissipation effect, simple in circuit structure and high in performance to price ratio, and also has the functions of over-current protection, over-voltage protection and over-temperature protection.

Description

A kind of Dimmable LED driver that adopts PAM2842 to realize
Technical field
The utility model relates to a kind of LED driver, and especially a kind of Dimmable LED driver that adopts PAM2842 to realize, belongs to lighting field.
Background technology
At present, LED lamp has started to replace various traditional lighting lamps, but LED self character restricted period driving power can not adopt same power supply with ordinary incandescent lamp.Because voltage fluctuation makes electric current increase can cause LED to damage, can fully meet the LED required driving requirement of working so must design new power supply driver, thereby bring into play to greatest extent the performance of LED, the generation of minimizing fault.But the driveability of existing various LED driving powers is unsatisfactory, as output current is subject to external voltage influence of fluctuations, easily cause LED to damage, reduction of service life; The curent change that flows through LED causing for reasons such as temperature can not well be adjusted, and the same phasic property of voltage and current is poor, and power factor is lower; And regulation output current precision is not high, poor stability, causes LED lamp to occur scintillation.On market all more or less there is the problem that uses a lot of control chips and complex peripheral circuit in the LED driver of high performance tunable optical, increased cost and the volume of driver.In addition, another design challenges of traditional LED driver is the design of constant current sampling amplification circuit voltage.Sampling voltage design is lower, and power work efficiency is just higher, and caloric value will reduce, and reliability improves, and the life-span is long.But sampling voltage design is lower, will be very high to the required precision of circuit sampling error amplifier circuit, signal to noise ratio will reduce.Therefore between the two, be difficult to design balance, cause drive power supply performance parameter can not reach optimum state.
Therefore be necessary to develop the Dimmable LED driver that a kind of novel employing PAM2842 realizes; make it adopt the integrated control chip PAM2842 design of performance; with digital signal PWM light modulation; light modulation precision is higher; antijamming capability is strong; efficiency is high, has overcurrent, overvoltage, overheat protector and good radiating effect simultaneously.
Summary of the invention
The utility model is for the problem of prior art; a kind of employing digital signal PWM light modulation is provided; light modulation precision is higher; antijamming capability is strong; efficiency is high; there is overcurrent, overvoltage, overheat protector and good radiating effect, and circuit structure is simple, the Dimmable LED driver that the employing PAM2842 that cost performance is very high realizes simultaneously.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
Described a kind of Dimmable LED driver that adopts PAM2842 to realize, comprise current rectifying and wave filtering circuit, constant-current drive circuit and LED load, it is characterized in that, load is connected successively in turn with LED for described current rectifying and wave filtering circuit, constant-current drive circuit, and it is PAM2842 that described constant-current drive circuit adopts chip model.
Further, also comprise frequency setting circuit, PWM light adjusting circuit, current detection circuit and overvoltage crowbar; Described frequency setting circuit, PWM light adjusting circuit, current detection circuit and overvoltage crowbar are connected with described constant-current drive circuit respectively.
Further, described PWM light adjusting circuit is made up of resistance R 15, resistance R 30 and metal-oxide-semiconductor Q1; Resistance R 15 one end are connected with described constant-current drive circuit chip COMP pin, and the other end is connected with the drain electrode of metal-oxide-semiconductor Q1, the source ground of metal-oxide-semiconductor Q1, and grid is connected with outside pwm control signal, and resistance R 30 connects the grid of metal-oxide-semiconductor Q1 to ground.
Further, described current detection circuit is made up of resistance R 5, R6 and R13, and resistance R 5 is connected with described constant-current drive circuit chip Sense+ pin with one end after R6 parallel connection, after other end series resistance R13, is connected with chip Sense-pin.
Further; described overvoltage crowbar is made up of voltage-stabiliser tube D1, inductance L 1, capacitor C o1, capacitor C o2, resistance R 3 and resistance R 4; the negative pole of voltage-stabiliser tube D1 is connected with outside input power is anodal; anodal with described in state constant-current drive circuit chip SW pin and be connected; capacitor C o1 and capacitor C o2 are connected in parallel on the two ends of described LED load; inductance L 1 connects the negative terminal of chip SW pin and described LED load, resistance R 3 with after resistance R 4 dividing potential drops with described in state constant-current drive circuit chip OV pin and be connected.
Further, described frequency setting circuit is made up of resistance R 1, and resistance R 1 connects described constant-current drive circuit chip RT pin to ground.
Further, described current rectifying and wave filtering circuit comprises capacitor C n1 and capacitor C n2, and capacitor C n1 and capacitor C n2 are parallel between outside input power positive pole and ground.
Further, described PWM light adjusting circuit also comprises resistance R 2 and capacitor C 5, and resistance R 2 one end are connected with described constant-current drive circuit chip COMP pin, and other end series capacitance C5 is to ground.
Further, described LED load is composed in series by ten LED lamp cylinders, and anodal and described current detection circuit is connected, and negative pole is connected with described constant-current drive circuit chip SW pin by described inductance L 1.
Further, described current rectifying and wave filtering circuit also comprises resistance R 8 and capacitor C 1, forms RC buffer and is connected with described constant-current drive circuit chip HVIN, EN pin.
Further, described metal-oxide-semiconductor Q1 model is 2N7002.
The Dimmable LED drive operation principle that a kind of PAM2842 of employing described in the utility model realizes is: after system powers on, low-voltage DC, after the capacitor C n1 and capacitor C n2 filtering of described current rectifying and wave filtering circuit, is given described constant-current drive circuit chip power supply.Described constant-current drive circuit chip limits output voltage not higher than 40V by OV pin and resistance R 3, R4, gives described LED load supplying, and chip operation is at boost mode.Be series at resistance R 5 between this of described LED load and described constant-current drive circuit chip Sense+ and Sense-pin, the resistance value of R6 by adjusting, chip can be set and export constant LED transient current; Give described PWM light adjusting circuit input square-wave pulse, can control the switch of the metal-oxide-semiconductor in described PWM light adjusting circuit, make the COMP pin of described constant-current drive circuit chip produce corresponding low and high level, thus conducting and the shutoff of control chip input LED electric current.Therefore, input to the duty ratio of the signal of described PWM light adjusting circuit by adjusting, can change the average current of described LED load of flowing through, thereby regulate the luminosity of described LED load.
The utility model has the advantage of: the Dimmable LED driver that provides a kind of PAM2842 of employing to realize; adopt the integrated control chip PAM2842 design of performance; with digital signal PWM light modulation; light modulation precision is higher; antijamming capability is strong, and efficiency is high, has overcurrent, overvoltage, overheat protector and good radiating effect simultaneously; and circuit structure is simple, cost performance is very high.
Brief description of the drawings
Fig. 1 is the principle block diagram of the Dimmable LED driver of a kind of PAM2842 of employing realization described in the utility model.
Fig. 2 is the circuit design principle figure of the Dimmable LED driver of a kind of PAM2842 of employing realization described in the utility model.
In accompanying drawing, division mark is as follows: 1, current rectifying and wave filtering circuit; 21, frequency setting circuit; 22, PWM light adjusting circuit; 23, current detection circuit; 24, overvoltage crowbar; 3, constant-current drive circuit; 4, LED load.
Embodiment
As shown in Figure 1; a kind of principle block diagram of the Dimmable LED driver that adopts PAM2842 realization; comprise current rectifying and wave filtering circuit 1, frequency setting circuit 21, PWM light adjusting circuit 22, current detection circuit 23, overvoltage crowbar 24, constant-current drive circuit 3 and LED load 4; described current rectifying and wave filtering circuit 1, constant-current drive circuit 3 and LED load 4 are connected successively in turn, and described frequency setting circuit 21, PWM light adjusting circuit 22, current detection circuit 23 and overvoltage crowbar 24 are connected with described constant-current drive circuit 3 respectively.
As shown in Figure 2, a kind of circuit design principle figure of the Dimmable LED driver that adopts PAM2842 realization.Described constant-current drive circuit 3 adopts the integrated linear constant-current driving LED chip of high-performance, and chip model is PAM2842.Described PWM light adjusting circuit 22 is made up of resistance R 15, resistance R 30, metal-oxide-semiconductor Q1, resistance R 2 and capacitor C 5; Resistance R 15 one end are connected with described constant-current drive circuit 3 chip COMP pin, and the other end is connected with the drain electrode of metal-oxide-semiconductor Q1, the source ground of metal-oxide-semiconductor Q1, and grid is connected with outside pwm control signal, and resistance R 30 connects the grid of metal-oxide-semiconductor Q1 to ground.Resistance R 2 one end are connected with described constant-current drive circuit 3 chip COMP pin, and other end series capacitance C5 is to ground.Described current detection circuit 23 is made up of resistance R 5, R6 and R13, and resistance R 5 is connected with described constant-current drive circuit 3 chip Sense+ pin with one end after R6 parallel connection, after other end series resistance R13, is connected with chip Sense-pin.Described overvoltage crowbar 24 is made up of voltage-stabiliser tube D1, inductance L 1, capacitor C o1, capacitor C o2, resistance R 3 and resistance R 4; the negative pole of voltage-stabiliser tube D1 is connected with outside input power is anodal; anodal with described in state constant-current drive circuit 3 chip SW pin and be connected; capacitor C o1 and capacitor C o2 are connected in parallel on the two ends of described LED load 4; inductance L 1 connects the negative terminal of chip SW pin and described LED load 4, resistance R 3 with after resistance R 4 dividing potential drops with described in state constant-current drive circuit 3 chip OV pin and be connected.Described frequency setting circuit 21 is made up of resistance R 1, and resistance R 1 connects described constant-current drive circuit 3 chip RT pin to ground.Described current rectifying and wave filtering circuit 1 comprises capacitor C n1, capacitor C n2, resistance R 8 and capacitor C 1, resistance R 8 forms RC buffer with capacitor C 1 and is connected with HVIN, the EN pin of described constant-current drive circuit chip 3, and capacitor C n1 and capacitor C n2 are parallel between outside input power positive pole and ground.Described LED load 4 is composed in series by ten LED lamp cylinders, and anodal and described current detection circuit 23 is connected, and negative pole is connected with described constant-current drive circuit 3 chip SW pin by described inductance L 1.
After system powers on, low-voltage DC, after the capacitor C n1 and capacitor C n2 filtering of described current rectifying and wave filtering circuit 1, is given described constant-current drive circuit 3 chip power supplies.Described constant-current drive circuit 3 chips limit output voltage by OV pin and resistance R 3, R4, power to described LED load 4.Vout=1.2* (1+R3/R4), in the present embodiment, resistance R 3, R4 get respectively 390K and 12K, Vout=40.2V.External power source uses 24V storage battery, boosts to 40.2V, and chip operation is at boost mode, and its efficiency can reach more than 95%.Be series at the LED electric current of the chip output that the resistance value of resistance R 5, the R6 of the current detection circuit 23 between described LED load 4 and described constant-current drive circuit 3 chip Sense+ and Sense-pin determines, Iled=0.1/Rsense.Owing to flowing through, the electric current of sampling resistor is larger, and resistance R 5, R6 will adopt the small resistor of high-power high-accuracy.Input square-wave pulse to described PWM light adjusting circuit 22, can control the switch of the metal-oxide-semiconductor in described PWM light adjusting circuit 22, make the COMP pin of described constant-current drive circuit 3 chips produce corresponding low and high level, thus conducting and the shutoff of control chip input LED electric current.When input PWM is low level while being Toff, metal-oxide-semiconductor Q1 conducting, chip COMP pin is high level, chip output LED electric current; When input PWM is high level while being Ton, metal-oxide-semiconductor Q1 cut-off, chip COMP pin is low level, chip output LED electric current is 0; Therefore, the average current Iavg=Toff*Iled/ (Ton+Toff) of the described LED load 4 of flowing through, LED average current was directly proportional to the low level time of pwm signal.Like this, input to the duty ratio of the signal of described PWM light adjusting circuit 22 by adjusting, can change the average current of described LED load 4 of flowing through, thereby regulate the luminosity of described LED load 4.The recommended frequency scope of input pwm signal is 100Hz~200Hz, because in the time that frequency is less than 100Hz, the time of metal-oxide-semiconductor Q1 cut-off is relatively long, and described LED load 4 can produce visible scintillation; In the time that frequency is greater than 200Hz, because being connected with capacitor C 5, chip COMP pin does filtering, extend the rise time of pulse, make the proportional relation of the duty ratio of LED average current and pwm signal have very large error, make light modulation produce capacitor discharge noise.In the time of zero load or circuit voltage fluctuation, can produce pulse voltage.The capacitor C o1 of described overvoltage crowbar 24 and capacitor C o2 play the effect of filtering overshoot voltage, and voltage-stabiliser tube D1 makes output voltage clamper in stationary value simultaneously, reaches overvoltage protection effect.The resistance R 1 of described frequency setting circuit 21 has determined the operating frequency of chip.In the present embodiment, resistance R 1 is got 200K, and making working frequency of chip is 196KHz.Described constant-current drive circuit 3 has short circuit overcurrent defencive function, and when one or more LED load short circuits, still can normally work in loop.Due to output LED current constant, output voltage is determined by the number of the LED load of real work.Described constant-current drive circuit 3 chips itself also have overheat protector function, and when chip temperature is higher than 150 DEG C, chip quits work; In the time that temperature is reduced to below 120 DEG C, chip restarts work.Native system integrated design degree is high, and the numerous components and parts that affect life of product such as transformer, electric capacity that saved conventional power source, are the more than 3 times of conventional power source life-span.And described constant-current drive circuit 3 chip PAM2842 multi-protective functions, make cost performance and stability very high.
Obviously above-described embodiment is not to restriction of the present utility model, and the Dimmable LED driver that above-mentioned a kind of PAM2842 of employing realizes can also have other many variations.Although discussed the utility model in detail in conjunction with above-mentioned example, should be understood that professional person in the industry can expect apparently some are identical, alternative scheme, within all falling into the protection range that the utility model claim limits.

Claims (8)

1. a Dimmable LED driver that adopts PAM2842 to realize, comprise current rectifying and wave filtering circuit (1), constant-current drive circuit (3) and LED load (4), it is characterized in that, also comprise frequency setting circuit (21), PWM light adjusting circuit (22), current detection circuit (23) and overvoltage crowbar (24); Described frequency setting circuit (21), PWM light adjusting circuit (22), current detection circuit (23) and overvoltage crowbar (24) are connected with described constant-current drive circuit (3) respectively; described current rectifying and wave filtering circuit (1), constant-current drive circuit (3) and LED load (4) are connected successively in turn, and it is PAM2842 that described constant-current drive circuit (3) adopts chip model.
2. the Dimmable LED driver that employing PAM2842 according to claim 1 realizes, is characterized in that, described PWM light adjusting circuit (22) is made up of resistance R 15, resistance R 30 and metal-oxide-semiconductor Q1; Resistance R 15 one end are connected with described constant-current drive circuit (3) chip COMP pin, and the other end is connected with the drain electrode of metal-oxide-semiconductor Q1, the source ground of metal-oxide-semiconductor Q1, and grid is connected with outside pwm control signal, and resistance R 30 connects the grid of metal-oxide-semiconductor Q1 to ground.
3. the Dimmable LED driver that employing PAM2842 according to claim 2 realizes, it is characterized in that, described current detection circuit (23) is made up of resistance R 5, R6 and R13, resistance R 5 is connected with described constant-current drive circuit (3) chip Sense+ pin with one end after R6 parallel connection, after other end series resistance R13, is connected with chip Sense-pin.
4. the Dimmable LED driver that employing PAM2842 according to claim 3 realizes, it is characterized in that, described overvoltage crowbar (24) is by voltage-stabiliser tube D1, inductance L 1, capacitor C o1, capacitor C o2, resistance R 3 and resistance R 4 form, the negative pole of voltage-stabiliser tube D1 is connected with outside input power is anodal, anodal with described in state constant-current drive circuit (3) chip SW pin and be connected, capacitor C o1 and capacitor C o2 are connected in parallel on the two ends of described LED load (4), inductance L 1 connects the negative terminal of chip SW pin and described LED load (4), resistance R 3 with after resistance R 4 dividing potential drops with described in state constant-current drive circuit (3) chip OV pin and be connected.
5. the Dimmable LED driver that employing PAM2842 according to claim 4 realizes, is characterized in that, described frequency setting circuit (21) is made up of resistance R 1, and resistance R 1 connects described constant-current drive circuit (3) chip RT pin to ground.
6. the Dimmable LED driver that employing PAM2842 according to claim 5 realizes, it is characterized in that, described current rectifying and wave filtering circuit (1) comprises capacitor C n1 and capacitor C n2, and capacitor C n1 and capacitor C n2 are parallel between outside input power positive pole and ground.
7. the Dimmable LED driver that employing PAM2842 according to claim 6 realizes, it is characterized in that, described PWM light adjusting circuit (22) also comprises resistance R 2 and capacitor C 5, resistance R 2 one end are connected with described constant-current drive circuit (3) chip COMP pin, and other end series capacitance C5 is to ground.
8. the Dimmable LED driver that employing PAM2842 according to claim 7 realizes, it is characterized in that, described LED load (4) is composed in series by ten LED lamp cylinders, anodal and described current detection circuit (23) is connected, and negative pole is connected with described constant-current drive circuit (3) chip SW pin by described inductance L 1.
CN201420239219.2U 2014-05-09 2014-05-09 PAM2842-based dimmable LED driver Expired - Fee Related CN203814023U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104582135A (en) * 2014-11-26 2015-04-29 成都岷创科技有限公司 LED (light-emitting diode) quick start-up circuit
CN105323931A (en) * 2015-11-17 2016-02-10 江苏豪迈照明科技有限公司 LED drive circuit
CN105898957A (en) * 2015-05-20 2016-08-24 深圳市光迹科技有限公司 Method for improving LED light modulation performance via variable frequency PWM
CN106413201A (en) * 2016-11-23 2017-02-15 赛尔富电子有限公司 Constant-current power supply with various current outputs for LED lamps
CN106413201B (en) * 2016-11-23 2024-04-09 赛尔富电子有限公司 Constant-current power supply for outputting various currents of LED lamp

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104582135A (en) * 2014-11-26 2015-04-29 成都岷创科技有限公司 LED (light-emitting diode) quick start-up circuit
CN105898957A (en) * 2015-05-20 2016-08-24 深圳市光迹科技有限公司 Method for improving LED light modulation performance via variable frequency PWM
CN105323931A (en) * 2015-11-17 2016-02-10 江苏豪迈照明科技有限公司 LED drive circuit
CN105323931B (en) * 2015-11-17 2019-03-15 江苏豪迈照明科技有限公司 A kind of LED drive circuit
CN106413201A (en) * 2016-11-23 2017-02-15 赛尔富电子有限公司 Constant-current power supply with various current outputs for LED lamps
CN106413201B (en) * 2016-11-23 2024-04-09 赛尔富电子有限公司 Constant-current power supply for outputting various currents of LED lamp

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Granted publication date: 20140903

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